object - Private function in Javascript constructor is not accessible publicly -


i have person object 

function person(first, last, age, eye) {     this.firstname = first;     this.lastname = last;     this.age = age;     this.eyecolor = eye;      function sayname(){         var full="";             full="hello name "+this.firstname + " "+this.lastname;     } }

and have made instance of object 

var raul = new person("raul","zamora","19","brown")

i cannot figure out why function sayname not working. implementing such:

document.getelementbyid("sayname").innerhtml=raul.sayname();

where sayname defined id on html part.

it doesn't work because sayname function visible in scope of constructor (and totally useless).

to make function available on instances, use 

person.prototype.sayname = function(){    var full="hello name "+this.firstname + " "+this.lastname;    return full; // don't forget return string }

for more details, suggest article mdn : introduction object-oriented javascript


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